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Zillions of Games. It can play an endless variety of abstract board games, and we have a large collection of Chess variants you can play on it.[All Comments] [Add Comment or Rating]
H. G. Muller wrote on Mon, Sep 23 01:11 PM UTC in reply to Aurelian Florea from 01:06 PM:

This is natural logarithm (base e). So ln 2 ~ 0.69, i.e. 69 elo for a speed doubling.

This is for engines playing orthodox chess, and seems to be quite universal. (Except when the level of play gets so high that almost all games end in a draw; then doubling the speed doesn't give so much Elo gain anymore, because even a perfect player can only beat a weaker player when the latter makes an error.)